Abstract
We report on the discovery of a 590 day long-term periodicity in the hard X-ray component of the microquasar GRS 1915+105 found from a comprehensive study of more than 4 years of Rossi X-Ray Timing Explorer observations. The periodicity is also observed in the hard X-ray flux observed by BATSE and in the radio flux as seen with the Green Bank Interferometer and the Ryle Telescope. We discuss various possible explanations, including the precession of a radiation-induced warped accretion disk.
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